torture: Eliminate duplicate #CHECK# from ConfigFragment

The #CHECK# directives that can be present in CFcommon and in the
rcutorture scenario Kconfig files are both copied to ConfigFragment
and grepped out of the two directive files and added to ConfigFragment.
This commit therefore removes the redundant "grep" commands and takes
advantage of the consequent opportunity to simplify redirection.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh

@@ -44,19 +44,17 @@ then
 fi
 echo ' ---' `date`: Starting build
 echo ' ---' Kconfig fragment at: $config_template >> $resdir/log
-touch $resdir/ConfigFragment.input $resdir/ConfigFragment
+touch $resdir/ConfigFragment.input
 if test -r "$config_dir/CFcommon"
 then
 	echo " --- $config_dir/CFcommon" >> $resdir/ConfigFragment.input
 	cat < $config_dir/CFcommon >> $resdir/ConfigFragment.input
 	config_override.sh $config_dir/CFcommon $config_template > $T/Kc1
-	grep '#CHECK#' $config_dir/CFcommon >> $resdir/ConfigFragment
 else
 	cp $config_template $T/Kc1
 fi
 echo " --- $config_template" >> $resdir/ConfigFragment.input
 cat $config_template >> $resdir/ConfigFragment.input
-grep '#CHECK#' $config_template >> $resdir/ConfigFragment
 if test -n "$TORTURE_KCONFIG_ARG"
 then
 	echo $TORTURE_KCONFIG_ARG | tr -s " " "\012" > $T/cmdline
@@ -67,7 +65,7 @@ then
 else
 	cp $T/Kc1 $T/Kc2
 fi
-cat $T/Kc2 >> $resdir/ConfigFragment
+cat $T/Kc2 > $resdir/ConfigFragment
 
 base_resdir=`echo $resdir | sed -e 's/\.[0-9]\+$//'`
 if test "$base_resdir" != "$resdir" -a -f $base_resdir/bzImage -a -f $base_resdir/vmlinux